Direct torque control for DFIG based wind turbines employing power line communication technology in smart grid environments

Abstract

This chapter proposes a control technique for a wind doubly fed induction generator (DFIG), based on direct torque control (DTC) with power references sent remotely via power line communication (PLC) technology. DTC achieves high dynamic performance, allowing independent control of DFIG electromagnetic torque and rotor flux magnitude. In this way, active and reactive power can be controlled by the voltage applied to the rotor independently. In order to operate in a smart grid (SG) environment, the proposed system employs PLC technology for transmitting the power references from the control center (CC) to the wind generator through power cables. The complete control system (controller and PLC), implemented in an experimental test bench, is presented in this chapter with results that validated the control strategy and the proposed system as a whole.